An environmental survey contained a question asking what respondents thought was the major cause of air pollution in this country, giving the choices "automobiles," "factories," and "incinerators." Two versions of the test, A and B, were used. Let pa and Pg be the respective proportions of people using forms A and B who select "factories." If 170 out of 460 people who used version A chose "factories" and 141 out of 440 people who used version B chose "factories," (a) Find a 95% confidence interval for PA - PB: (b) Do the versions seem to be consistent concerning this answer? Why or why not?

An environmental survey contained a question asking what respondents thought was the major cause of air pollution in this country, giving the choices "automobiles," "factories," and "incinerators." Two versions of the test, A and B, were used. Let pa and Pg be the respective proportions of people using forms A and B who select "factories." If 170 out of 460 people who used version A chose "factories" and 141 out of 440 people who used version B chose "factories," (a) Find a 95% confidence interval for PA - PB: (b) Do the versions seem to be consistent concerning this answer? Why or why not?

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Description: An environmental survey contained aquestion asking what respondentsthought was the major cause of airpollution in this country, giving thechoices "automobiles," "factories," and"incinerators." Two versions of thetest, A and B, were used. Let pa andP

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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